“ Numerous variations in detail are found in the different genera; in Salvia (fig. 2) , for instance, there is a lever mechanism, the barren half of each anther forming a knob at the end of a short arm which when touched by the head of an insect causes the anther at the end of the longer arm to descend on the insect’s back. In the less common type, where the anterior part of the flower is more developed, as in the Ocimoideae, the stamens and style lie on the under lip and honey is secreted on the upper side of the hypogynous disk ”

“ The shape of the corolla varies widely, the differences being doubtless intimately associated with the pollination of the flowers by insect-agency. The tube is straight or variously bent and often widens towards the mouth. Occasionally the limb is equally five-toothed, or forms, as in Mentha (fig. 2, 3, 4) an almost regular four-toothed corolla by union of the two posterior teeth. ”